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Dover, Del. • A Delaware judge says Texas pipeline company Energy Transfer Equity can back out of its proposed $33 billion acquisition of Williams Cos.

Friday's ruling came in a lawsuit filed by Williams to hold Energy Transfer to the deal.

The companies announced in September that Dallas-based Energy Transfer would acquire Williams, based in Tulsa, Okla. Williams shareholders were to receive Energy Transfer stock, $6 billion cash and a special dividend.

But the deal became less attractive as oil prices plummeted.

Energy Transfer later said it has been unable to get an opinion from attorneys confirming a tax-free exchange, which is a deal requirement.

Williams argued that Energy Transfer was using the tax opinion as a ruse to miss a June 28 merger deadline and was deliberately trying to scuttle the deal.